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Question

How many grams of H2O will be formed when 16.0 g H2 is mixed with 16.0 g O2 and allowed to react to form water?

A
9.0 g
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B
18.0 g
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C
32.0 g
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D
36.0 g
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E
72.0 g
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Solution

The correct option is B 18.0 g
H2+12O2H2O

1 mole of H2 combines with a half mole of O2 to form one mole of H2O.
The molecular weights of H2, O2 and H2O are 2 g/mol, 32 g/mol and 18 g/mole respectively.
2 g (1 mole) of H2 combines with 16 g (half mole) of O2 to form 18 g (one mole) of H2O.
We have 16.0 H2 is mixed with 16.0g O2
Out of this, 2.0 H2 will combine with 16.0g O2 since oxygen mass is limited.

18 g (one mole) of H2O will be obtained.

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